Effect of Viscosity on Steady-State Voltammetry and Scanning Electrochemical Microscopy in Room Temperature Ionic Liquids

2010 ◽  
Vol 114 (13) ◽  
pp. 4442-4450 ◽  
Author(s):  
Kevin R. J. Lovelock ◽  
Frances N. Cowling ◽  
Alasdair W. Taylor ◽  
Peter Licence ◽  
Darren A. Walsh
Keyword(s):  
Ionic Liquids ◽  
Steady State ◽  
Room Temperature ◽  
Scanning Electrochemical Microscopy ◽  
Room Temperature Ionic Liquids ◽  
Electrochemical Microscopy

Prospects for the Application of Scanning Electrochemical Microscopy in Ionic Liquids

2007 ◽  
Vol 60 (1) ◽  
pp. 29 ◽  
Author(s):  
Maurizio Carano ◽  
Alan M. Bond
Keyword(s):  
Ionic Liquid ◽  
Ionic Liquids ◽  
Steady State ◽  
Aqueous Media ◽  
Scanning Electrochemical Microscopy ◽  
State Theory ◽  
Glass Substrates ◽  
State Behaviour ◽  
Ag Substrate ◽  
Electrochemical Microscopy

Prospects have been assessed for the application of the technique of scanning electrochemical microscopy (SECM) in viscous ionic liquids. Use of the Fc0/+ redox couple (Fc = ferrocene) to obtain microelectrode approach curves revealed that the required steady state behaviour needed for analysis of data relevant to conducting platinum and insulating glass substrates is moderately easy to achieve in a 1-butyl-3-methylimidazolium tetrafluoroborate ([BMIM][BF4]) ionic liquid. However, in the more highly viscous 1-butyl-3-methylimidazolium hexafluorophosphate ionic liquid, where significantly lower diffusion coefficients are encountered, approach-curve data that conform to steady state theory are only found with very small microelectrodes (e.g., ≤2 μm diameter), very slow electrode–substrate approach rates (e.g., ≤0.05 μm s–1), and long equilibration times (e.g., 50 s). A comparison is provided with SECM approach curves acquired in aqueous media. SECM images of an Ag substrate in contact with [BMIM][BF4] also are presented and are of only slightly inferior quality to images obtained in water.

Sign in / Sign up

Export Citation Format

Share Document